By inverse chronogical order of preparation (older first):
A. Ceres, C. Costoya, and A. Viruel, "Hom-counting functions, combinatorial categories and related problems" [arXiv]
C. Costoya, R. Gomes and A. Viruel, "Rigidifying simplicial complexes and realizing group actions" [arXiv]
A. Díaz Ramos, R. Molinier and A. Viruel, "Every finite group is represented by a finite incidence geometry" [arXiv]